Synthesis p. 242 - 243 (1994)
Update date:2022-08-10
Topics:
Haglund
Nilsson
A regioselective, vicarious nucleophilic substitution of 1,3- dinitrobenzene with α-bromo- and iodocarbanions proceeds in the presence of copper(1) tert-butoxide and pyridine giving 2,6-dinitrophenylmalonates, 2,6- dinitrophenylacetates or 2,6-dinitrophenylacetonitrile as the only isomers from bromomalonate esters, bromoacetate esters, iodoacetate esters or iodoacetonitrile, respectively. Without copper(I) tert-butoxide, the 4- substituted isomer is the only product. We believe that the reaction proceeds via a σ-adduct of 1,3-dinitrobenzene and halocarbanion from which hydrogen and halogen are eliminated. This elimination is dependent upon the concentration of copper(I) tert-butoxide.
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